Journal of Chemical and Engineering Data, Vol.48, No.1, 158-166, 2003
Isopiestic determination of the osmotic and activity coefficients of aqueous sodium trifluoromethanesulfonate at 298.15 K and 323.15 K, and representation with an extended ion-interaction (Pitzer) model
Isopiestic vapor-pressure measurements were made for aqueous sodium trifluoromethanesulfonate, NaCF3-SO3(aq), using NaCI(aq) as the reference standard. The measurements for NaCF3SO3(aq) cover the molality range from 0.13643 mol.kg(-1) to 5.3735 mol.kg(-1) at 298.15 K and from 0.14504 mol.kg(-1) to 4.3070 mol.kg(-1) at 323.15 K. Values of the four parameters of an extended version of Pitzer's model for osmotic and activity coefficients, with an ionic-strength dependent third virial coefficient, were evaluated for NaCF3SO3(aq) at both temperatures, as were those of the usual three-parameter Pitzer model.